Annual, (5-) 10-30 (-40) cm tall, erect, sparsely branched or simple, appressedly hairy with bipartite hairs only. Leaves oblanceolate or oblong-spathulate, entire, lower stalked, upper sessile, 10-50 mm long, 2-8 mm broad, obtuse. Racemes 5-15 (-25) - flowered, up to 15 (-20) cm long in fruit. Flowers c. 3 mm across, yellow; pedicels inconspicuous, c. 1 (-1.5) mm long and thickened in fruit, suberect or ascending. Sepals c. 2.5 mm long. Petals 3-4 (-5) mm long, 1 mm broad. Stamens c. 2: 3 mm long; anthers c. 0.7 mm long. Siliquae linear-terete or subcylindrical, (15-) 20-25 (-30) mm long, 1-1.5 mm broad, often straight, subtorulose, appressedly hairy; valves with a distinct mid-rib; stigma sub-bibbed, capitate, subsessile or sessile; seeds 10-15 in each locule, c. 1 mm long, ellipsoid, brown.